"So I have had one of my really pricey and very well gun for 2 and a half years now and I noticed that it couldn't hold a charge and that it had a lower rate of fire and had a lower fps. At first I thought of getting a new gear box but I wanted to try everything before I did that. So I bought this new battery. My gun has never worked better. Unlike other batteries that get wicked hot either in your gun or charger. This one didn't at all get hot. Oh by the way it fits all of the CYMA ak47s so don't worry about that."